Mercurial > dropbear
annotate cli-session.c @ 727:00bc3df3a9c3
Don't bother waiting for a ssh-connection service reply - the server
will disconnect if it wasn't accepted
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 31 Mar 2013 21:38:17 +0800 |
| parents | 78eda530c000 |
| children | 9a5438271556 |
| rev | line source |
|---|---|
|
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1 /* |
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2 * Dropbear SSH |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * Copyright (c) 2004 by Mihnea Stoenescu |
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6 * All rights reserved. |
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7 * |
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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9 * of this software and associated documentation files (the "Software"), to deal |
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10 * in the Software without restriction, including without limitation the rights |
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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12 * copies of the Software, and to permit persons to whom the Software is |
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13 * furnished to do so, subject to the following conditions: |
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14 * |
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15 * The above copyright notice and this permission notice shall be included in |
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16 * all copies or substantial portions of the Software. |
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17 * |
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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24 * SOFTWARE. */ |
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25 |
| 26 | 26 #include "includes.h" |
| 27 #include "session.h" | |
| 28 #include "dbutil.h" | |
| 29 #include "kex.h" | |
| 30 #include "ssh.h" | |
| 31 #include "packet.h" | |
| 64 | 32 #include "tcpfwd.h" |
| 26 | 33 #include "channel.h" |
| 34 #include "random.h" | |
| 33 | 35 #include "service.h" |
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36 #include "runopts.h" |
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37 #include "chansession.h" |
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38 #include "agentfwd.h" |
| 26 | 39 |
| 40 static void cli_remoteclosed(); | |
| 41 static void cli_sessionloop(); | |
| 33 | 42 static void cli_session_init(); |
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43 static void cli_finished(); |
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44 static void recv_msg_service_accept(void); |
| 26 | 45 |
| 46 struct clientsession cli_ses; /* GLOBAL */ | |
| 47 | |
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48 /* Sorted in decreasing frequency will be more efficient - data and window |
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49 * should be first */ |
| 26 | 50 static const packettype cli_packettypes[] = { |
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51 /* TYPE, FUNCTION */ |
| 26 | 52 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, |
| 107 | 53 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data}, |
| 26 | 54 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, |
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55 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */ |
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56 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */ |
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57 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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58 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */ |
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59 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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60 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */ |
| 26 | 61 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, |
| 62 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
| 63 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
| 64 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
| 65 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
| 66 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
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67 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */ |
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68 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */ |
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69 #ifdef ENABLE_CLI_REMOTETCPFWD |
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70 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */ |
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71 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */ |
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72 #endif |
| 26 | 73 {0, 0} /* End */ |
| 74 }; | |
| 75 | |
| 76 static const struct ChanType *cli_chantypes[] = { | |
| 64 | 77 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 78 &cli_chan_tcpremote, | |
| 79 #endif | |
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80 #ifdef ENABLE_CLI_AGENTFWD |
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81 &cli_chan_agent, |
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82 #endif |
| 26 | 83 NULL /* Null termination */ |
| 84 }; | |
| 33 | 85 |
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86 void cli_session(int sock_in, int sock_out) { |
| 26 | 87 |
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88 seedrandom(); |
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89 |
| 26 | 90 crypto_init(); |
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91 |
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92 common_session_init(sock_in, sock_out); |
| 26 | 93 |
| 94 chaninitialise(cli_chantypes); | |
| 95 | |
| 33 | 96 /* Set up cli_ses vars */ |
| 97 cli_session_init(); | |
| 26 | 98 |
| 99 /* Ready to go */ | |
| 100 sessinitdone = 1; | |
| 101 | |
| 102 /* Exchange identification */ | |
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103 send_session_identification(); |
| 26 | 104 |
| 105 send_msg_kexinit(); | |
| 106 | |
| 107 session_loop(cli_sessionloop); | |
| 108 | |
| 109 /* Not reached */ | |
| 110 | |
| 33 | 111 } |
| 26 | 112 |
| 33 | 113 static void cli_session_init() { |
| 114 | |
| 115 cli_ses.state = STATE_NOTHING; | |
| 116 cli_ses.kex_state = KEX_NOTHING; | |
| 117 | |
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118 cli_ses.tty_raw_mode = 0; |
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119 cli_ses.winchange = 0; |
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120 |
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121 /* We store std{in,out,err}'s flags, so we can set them back on exit |
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122 * (otherwise busybox's ash isn't happy */ |
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123 cli_ses.stdincopy = dup(STDIN_FILENO); |
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124 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0); |
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125 cli_ses.stdoutcopy = dup(STDOUT_FILENO); |
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126 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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127 cli_ses.stderrcopy = dup(STDERR_FILENO); |
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128 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0); |
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129 |
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130 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a |
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131 specific exit status */ |
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132 |
| 47 | 133 /* Auth */ |
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134 cli_ses.lastprivkey = NULL; |
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135 cli_ses.lastauthtype = 0; |
| 47 | 136 |
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137 #ifdef DROPBEAR_NONE_CIPHER |
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138 cli_ses.cipher_none_after_auth = get_algo_usable(sshciphers, "none"); |
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139 set_algo_usable(sshciphers, "none", 0); |
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140 #else |
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141 cli_ses.cipher_none_after_auth = 0; |
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142 #endif |
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143 |
| 33 | 144 /* For printing "remote host closed" for the user */ |
| 145 ses.remoteclosed = cli_remoteclosed; | |
| 146 ses.buf_match_algo = cli_buf_match_algo; | |
| 147 | |
| 148 /* packet handlers */ | |
| 149 ses.packettypes = cli_packettypes; | |
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150 |
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151 ses.isserver = 0; |
| 26 | 152 } |
| 153 | |
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154 static void send_msg_service_request(char* servicename) { |
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155 |
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156 TRACE(("enter send_msg_service_request: servicename='%s'", servicename)) |
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157 |
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158 CHECKCLEARTOWRITE(); |
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159 |
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160 buf_putbyte(ses.writepayload, SSH_MSG_SERVICE_REQUEST); |
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161 buf_putstring(ses.writepayload, servicename, strlen(servicename)); |
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162 |
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163 encrypt_packet(); |
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164 TRACE(("leave send_msg_service_request")) |
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165 } |
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166 |
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167 static void recv_msg_service_accept(void) { |
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168 // do nothing, if it failed then the server MUST have disconnected |
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169 } |
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170 |
| 33 | 171 /* This function drives the progress of the session - it initiates KEX, |
| 172 * service, userauth and channel requests */ | |
| 26 | 173 static void cli_sessionloop() { |
| 174 | |
|
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175 TRACE(("enter cli_sessionloop")) |
| 33 | 176 |
|
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177 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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178 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 179 } |
| 180 | |
|
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181 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 182 |
| 183 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 184 * negotiation would have failed. */ | |
| 185 send_msg_kexdh_init(); | |
| 186 cli_ses.kex_state = KEXDH_INIT_SENT; | |
|
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187 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")) |
| 33 | 188 return; |
| 189 } | |
| 190 | |
| 191 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 192 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 193 && ses.kexstate.sentkexinit == 0) { | |
| 194 cli_ses.kex_state = KEX_NOTHING; | |
| 195 } | |
| 196 | |
| 197 /* We shouldn't do anything else if a KEX is in progress */ | |
| 198 if (cli_ses.kex_state != KEX_NOTHING) { | |
|
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199 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")) |
| 33 | 200 return; |
| 201 } | |
| 202 | |
| 203 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 204 * in normal operation */ | |
| 205 if (ses.kexstate.donefirstkex == 0) { | |
|
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206 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")) |
|
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207 return; |
| 33 | 208 } |
| 209 | |
| 26 | 210 switch (cli_ses.state) { |
| 211 | |
| 33 | 212 case STATE_NOTHING: |
| 213 /* We've got the transport layer sorted, we now need to request | |
| 214 * userauth */ | |
| 215 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 216 cli_auth_getmethods(); | |
|
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217 cli_ses.state = USERAUTH_REQ_SENT; |
|
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218 TRACE(("leave cli_sessionloop: sent userauth methods req")) |
| 33 | 219 return; |
| 220 | |
| 221 case USERAUTH_FAIL_RCVD: | |
| 222 cli_auth_try(); | |
|
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223 cli_ses.state = USERAUTH_REQ_SENT; |
|
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224 TRACE(("leave cli_sessionloop: cli_auth_try")) |
| 33 | 225 return; |
| 226 | |
| 37 | 227 case USERAUTH_SUCCESS_RCVD: |
|
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228 |
|
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229 #ifdef DROPBEAR_NONE_CIPHER |
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230 if (cli_ses.cipher_none_after_auth) |
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231 { |
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232 set_algo_usable(sshciphers, "none", 1); |
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233 send_msg_kexinit(); |
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234 } |
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235 #endif |
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236 |
|
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237 if (cli_opts.backgrounded) { |
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238 int devnull; |
|
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239 /* keeping stdin open steals input from the terminal and |
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240 is confusing, though stdout/stderr could be useful. */ |
|
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241 devnull = open(_PATH_DEVNULL, O_RDONLY); |
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242 if (devnull < 0) { |
|
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243 dropbear_exit("Opening /dev/null: %d %s", |
|
326
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244 errno, strerror(errno)); |
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245 } |
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246 dup2(devnull, STDIN_FILENO); |
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247 if (daemon(0, 1) < 0) { |
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248 dropbear_exit("Backgrounding failed: %d %s", |
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249 errno, strerror(errno)); |
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250 } |
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251 } |
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252 |
| 64 | 253 #ifdef ENABLE_CLI_LOCALTCPFWD |
|
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254 setup_localtcp(); |
| 64 | 255 #endif |
|
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256 #ifdef ENABLE_CLI_REMOTETCPFWD |
|
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257 setup_remotetcp(); |
|
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258 #endif |
|
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259 |
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260 #ifdef ENABLE_CLI_NETCAT |
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261 if (cli_opts.netcat_host) { |
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262 cli_send_netcat_request(); |
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263 } else |
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264 #endif |
| 560 | 265 if (!cli_opts.no_cmd) { |
|
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266 cli_send_chansess_request(); |
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267 } |
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268 TRACE(("leave cli_sessionloop: running")) |
| 37 | 269 cli_ses.state = SESSION_RUNNING; |
| 270 return; | |
| 271 | |
|
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272 case SESSION_RUNNING: |
|
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273 if (ses.chancount < 1 && !cli_opts.no_cmd) { |
|
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274 cli_finished(); |
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275 } |
|
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276 |
|
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277 if (cli_ses.winchange) { |
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278 cli_chansess_winchange(); |
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279 } |
|
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280 return; |
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281 |
| 33 | 282 /* XXX more here needed */ |
| 283 | |
| 284 | |
| 285 default: | |
| 286 break; | |
| 26 | 287 } |
| 288 | |
|
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289 TRACE(("leave cli_sessionloop: fell out")) |
| 26 | 290 |
| 291 } | |
| 292 | |
|
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293 void cli_session_cleanup() { |
|
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294 |
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295 if (!sessinitdone) { |
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296 return; |
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297 } |
|
99
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298 |
|
175
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299 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if |
|
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300 * we don't revert the flags */ |
|
100
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301 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags); |
|
175
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302 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags); |
|
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303 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags); |
|
99
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304 |
|
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305 cli_tty_cleanup(); |
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306 |
|
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|
307 } |
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308 |
|
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|
309 static void cli_finished() { |
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310 |
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311 cli_session_cleanup(); |
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312 common_session_cleanup(); |
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313 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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314 cli_opts.remotehost, cli_opts.remoteport); |
|
108
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315 exit(cli_ses.retval); |
|
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316 } |
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317 |
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318 |
| 26 | 319 /* called when the remote side closes the connection */ |
| 320 static void cli_remoteclosed() { | |
| 321 | |
| 322 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 323 * already sent/received disconnect message(s) ??? */ | |
|
479
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324 m_close(ses.sock_in); |
|
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325 m_close(ses.sock_out); |
|
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326 ses.sock_in = -1; |
|
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|
327 ses.sock_out = -1; |
|
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|
328 dropbear_exit("Remote closed the connection"); |
| 26 | 329 } |
| 43 | 330 |
| 331 /* Operates in-place turning dirty (untrusted potentially containing control | |
|
249
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332 * characters) text into clean text. |
|
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diff
changeset
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333 * Note: this is safe only with ascii - other charsets could have problems. */ |
| 43 | 334 void cleantext(unsigned char* dirtytext) { |
| 335 | |
| 336 unsigned int i, j; | |
| 47 | 337 unsigned char c; |
| 43 | 338 |
| 339 j = 0; | |
| 340 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 341 | |
| 342 c = dirtytext[i]; | |
| 343 /* We can ignore '\r's */ | |
| 344 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 345 dirtytext[j] = c; | |
| 346 j++; | |
| 347 } | |
| 348 } | |
| 349 /* Null terminate */ | |
| 350 dirtytext[j] = '\0'; | |
| 351 } |